Question about conditioning my new android lithium battery.

I dont understand what's happening with my phone. Have old Xperia Z3 D6603 (running android 6.0 marshmallow).

Had problems with battery since it was not lasting even 5 minutes so bought a new battery from ebay and installed it yesterday.

So first time I put it to my phone it showed that it had 70% of charge. I've read in battery description that I have to discharge the battery and recharge 3 times.

First time I wanted to discharge from 70% to 1% and with a battery discharge app + youtube 1080p videos + wifi signal it took only around 1 hour and phone was at 1%. From 1% till complete discharge it took me extra hour and then phone died.

I plugged it to charge and after 15 minutes it showed that battery now is at 100% (which is insane, it should take 2-3hrs to charge it up to 100%). So I charget it for 2-3 hrs ignoring that it said 100% already.

I discharget it from 100% to 1% in 1 hour and now again phone is stuck at 1% and it took me 2 more hours to discharge phone until battery died completely.

I don't believe that this behaviour will fix itself. How can I fix this problem so that battery percentage would be distributed evenly? Now it drops from 100% to 1% in 1hr and then from 1% to 0% in 2 hrs.